Chemistry Question

Introduction to ChemistryExam I Unit Analysis and Energy
Fall 2022
Name _________________________
This is an ‘At Home Exam’ due Fri Oct 7, 2022 on later than 11:30 p.m. on Blackboard.
Print out this exam. Neatly show all work. Answers with no work will only receive partial
credit. If needed, use scratch paper to work out the calculation and then neatly show work in the
space provided. Do not attach additional pages. Submit this exam as one pdf. Do not submit
individual pdf pages. Do not submit all pages on one page. Submit this exam as one pdf with
four consecutive pages. If you do not have a printer, contact me and we can discuss other
options for you.
You can use whatever resources needed, except:
Do not copy answers from other students in the class.
Do not ask for help at the Tutoring Center.
Be careful: the internet if full of misinformation.
1. Write in scientific notation: Show all work and correct significant figures.
a.
2470
b.
0.000860
2. Show all work and units.
a. convert 55 oC to Fahrenheit units
b. convert 112 oF to Kelvin units
3. Conversions: Show all work, units and correct significant figures.
(An answer with no work nor units will only receive partial credit.)
a. convert 512 qt into L
b. convert 450 mL into cc
c. convert 88 kJ into cal
4. If urine has a density of 2.55 g/mL, how many milliliters are in a mass of 420 mg?
Show all work, units, and correct significant figures.
(An answer with no work nor units will only receive partial credit.)
5. If the infusion rate for normal saline is 14 drops/min and the tubing has a drip factor of
22 drops/mL. How many mL of normal saline will the patient receive in 15 hours?
(An answer with no work nor units will only receive partial credit.)
6. If a metal block has a volume of 0.352 mL and a mass of 765.0 mg, what is the density of the
block in g/mL? Show all work, units, and correct significant figures.
(An answer with no work nor units will only receive partial credit.)
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7.
A person walks on a treadmill at a rate of 4.2 mph and burns approximately
340 kcal per hour, how many pounds of fat are burned if they walk for 118 miles and there
are 3500 kcal per 1 pound of fat? Show all work and correct significant figures.
(An answer with no work nor units will only receive partial credit.)
8.
A person has a car that gets 36 mpg and they have $25 to purchase gasoline that costs
$3.65/gal. If they travel at an average rate of 45 mph, for how many minutes can they
travel? Show all work and correct significant figures.
(An answer with no work nor units will only receive partial credit.)
9a. How many kilojoules are needed to evaporate 888 g of water?
Show all work and correct significant figures.
(An answer with no work nor units will only receive partial credit.)
9b. Was heat added or lost in the process?
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10a.
A 12.3 g sample of water goes from 85 oC to 42 oC.
Calculate the amount of heat energy (in calories) involved in this process.
Show all work and correct significant figures.
(An answer with no work nor units will only receive partial credit.)
10b. Was heat added or lost in the process?
11a.
How many kilojoules are needed to freeze 544 g of water?
Show all work and correct significant figures.
(An answer with no work nor units will only receive partial credit.)
11b. Was heat added or lost in the process?
12.
If a serving of French fries has 48 grams of fat, 17 grams of carbohydrates, and
9 grams of protein. Determine how many kilocalories are in one serving. Show all work
and correct significant figures. (An answer with no work nor units will only receive
partial credit.)
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